fact-family/add-sub-within-20-write-all · 套题 25
6 problems
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1
Write the fact family for 2, 13, 15:
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2
Write the fact family for 9, 4, 13:
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3
Write the fact family for 11, 9, 20:
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4
Write the fact family for 16, 3, 19:
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5
Write the fact family for 6, 3, 9:
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6
Write the fact family for 12, 6, 18:
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